I am often asked if a particular stadium has a "hot gun". The following is a list of corrections/offsets that we use in our data.

These #s use a rolling average of 10 games on either side; so, they are not yet nearly as precise at the very start of the season. Additionally, we use 55' (rather than the gameday standard 50') to compute velo, because it is a more accurate reflection of where the pitcher releases the ball.

For the following table, a negative mph number indicates a cool gun and a positive number indicates a hot gun.

You can also see that several stadiums have relatively large positive values for pfx_x, which indicates that movement is shifted right from the catcher's POV (or left, or negative numbers). Again, these are corrected out of the data displayed on the site.

Because these values change, these values reflect the current corrections applied on 03/24/2017. We also keep historical records on each game's offset for use on our cards and data system.
For more information, please contact dan@brooksbaseball.net

homemphpfx_xpfx_zx0z0axayazvx0vy0vz0
1 0.299 -0.361 0.618 0.212 0.102 -0.623 1.566 1.069 0.009 -0.436 -0.362
10 -0.088 0.728 -0.214 0.033 -0.138 1.211 -1.409 -0.27 -0.355 0.118 0.379
12 -0.303 2.519 0.763 0.423 0.021 4.237 1.743 1.239 -1.862 0.445 0.017
13 -0.725 0.262 0.998 0.262 -0.093 0.388 -4.107 1.698 -0.959 1.045 0.087
14 0.065 -0.72 0.432 -0.132 0.098 -1.14 2.243 0.648 0.702 -0.069 -0.28
15 -0.492 0.353 0.134 0.434 -0.089 0.604 -1.753 0.224 -0.885 0.71 -0.134
16 -0.242 -0.669 -0.43 -0.083 -0.08 -1.074 -0.732 -0.822 0.357 0.363 0.273
17 0.378 -0.621 0.338 -0.137 -0.042 -1.083 0.388 0.628 0.723 -0.538 0.051
19 -0.509 1.446 -1.573 0.108 -0.104 2.6 -3.951 -2.87 -0.796 0.696 0.859
2 -0.456 -0.057 0.727 0.105 0.177 -0.038 -1.437 1.242 -0.083 0.684 -0.324
20 -0.062 0.93 -0.211 -0.012 -0.147 1.585 -0.037 -0.293 -0.328 0.084 0.346
22 0.32 -0.768 0.765 0.014 -0.047 -1.31 0.686 1.283 0.362 -0.479 -0.311
239 -0.203 -0.571 -0.049 0.006 0.062 -0.94 -1.814 -0.121 0.32 0.3 -0.273
25 -0.152 -0.206 -0.59 -0.092 -0.151 -0.368 -3.638 -0.719 0.119 0.191 0.584
253 -0.396 0.181 -0.274 -0.119 -0.024 0.307 -1.58 -0.398 0.496 0.594 0.363
260 -1.433 -0.937 0.57 0.021 -0.05 -1.592 -3.034 0.611 0.293 2.084 -0.035
268 0.318 -0.873 0.262 -0.189 -0.045 -1.505 1.661 0.413 0.851 -0.438 -0.152
288 0.588 -1.338 -0.459 -0.031 -0.159 -2.396 1.268 -0.752 0.832 -0.855 0.458
3 0.47 1.228 0.087 -0.006 0.039 2.137 1.013 0.202 -0.249 -0.703 -0.223
31 0.332 0.75 -0.259 -0.031 0.071 1.303 -0.054 -0.429 0.029 -0.486 -0.294
32 -0.336 -0.265 -0.245 0.081 -0.031 -0.375 -0.575 -0.538 -0.021 0.478 0.266
328 0.232 -0.168 -0.573 0.098 -0.073 -0.294 2.076 -1.036 -0.235 -0.362 0.304
330 0.202 -0.69 0.381 0.122 0.254 -1.211 0.805 0.632 0.152 -0.274 -0.847
331 -0.022 1.589 -0.368 0.057 -0.013 2.847 -0.876 -0.696 -0.65 0.03 0.056
4 0.585 -0.682 -1.028 -0.014 -0.17 -1.158 1.906 -1.854 0.572 -0.874 0.782
401 -1.455 0.199 -0.185 -0.003 -0.066 0.846 10.535 -1.318 -0.063 2.118 1.08
416 -0.521 -0.048 1.024 -0.139 0.021 0.005 0.957 1.541 0.291 0.77 -0.183
424 -0.615 -1.539 3.416 -0.142 0.002 -2.568 0.593 5.577 0.919 0.952 -1.011
5 -0.623 0.96 0.415 0.205 0.071 1.662 -1.971 0.589 -0.966 0.907 -0.052
501 -1.031 -1.029 -0.384 0.233 -0.018 -1.972 -3.889 -0.718 -0.012 1.522 0.845
680 0.796 -0.75 -2.237 0.142 -0.143 -1.332 4.306 -3.796 -0.078 -1.203 1.043
7 0.169 -1.462 0.732 0.142 0.051 -2.507 0.359 1.26 0.198 -0.237 -0.447
8 0.058 -0.72 0.836 -0.052 0.091 -1.322 0.517 1.468 0.412 -0.049 -0.347
9 0.579 -0.719 0.23 -0.02 0.084 -1.271 -0.686 0.581 0.063 -0.836 -0.307
ana 0.497 -0.765 0.714 -0.037 -0.006 -1.341 1.72 1.301 0.58 -0.711 -0.371
ari -0.172 0.006 0.12 0.083 -0.051 -0.009 -0.577 0.204 -0.149 0.264 -0.46
atl -0.409 0.232 -0.125 -0.057 -0.027 0.47 -1.591 -0.251 0.092 0.599 0.177
bal -0.312 0.282 0.348 0.297 0.138 0.549 -0.154 0.505 -0.662 0.453 -0.333
bos 0.093 1.269 0.939 0.124 -0.082 2.157 0.352 1.549 -0.569 -0.152 -0.284
cha 0.166 -1.05 0.187 -0.032 -0.056 -1.814 1.821 0.172 0.717 -0.239 -0.09
chn -0.685 -1.021 0.312 -0.218 -0.036 -1.617 -1.094 0.393 0.828 1.018 0.018
cin -0.059 0.65 0.141 -0.183 0.074 1.168 -1.71 0.25 0.435 0.097 -0.295
cle -0.203 0.493 -0.097 -0.015 0.08 0.914 -1.768 -0.147 -0.231 0.286 -0.174
col 0.433 1.411 -1.395 0.098 -0.107 2.468 -2.528 -2.362 -0.726 -0.676 0.528
det 0.171 -0.767 0.563 0.013 -0.038 -1.334 -1.139 1.06 0.464 -0.24 -0.455
flo -0.108 0.9 -0.159 -0.007 -0.152 1.544 -0.094 -0.221 -0.325 0.151 0.323
hou 0.137 2.184 0.407 0.13 -0.073 3.692 3.402 0.583 -1.116 -0.238 0.005
kca -0.295 -1.504 0.942 0.194 -0.138 -2.488 -0.214 1.558 0.103 0.428 -0.222
lan 0.528 -0.807 0.381 0.054 -0.1 -1.403 0.849 0.707 0.285 -0.775 0.021
mia -0.602 -0.028 0.682 0.165 0.024 0.05 0.814 0.963 -0.306 0.891 -0.289
mil 0.22 -0.565 -0.253 0.057 0.006 -1.014 0.275 -0.454 0.157 -0.311 -0.066
min -0.795 1.136 -0.12 0.091 0.067 1.98 -1.302 -0.437 -0.496 1.166 -0.033
nya 0.128 -0.102 1.218 -0.149 -0.038 -0.144 0.61 2.162 0.063 -0.185 -0.545
nyn -0.233 0.515 -0.612 -0.236 0.026 0.955 1.72 -1.206 0.374 0.347 0.033
oak -0.449 0.694 -0.364 0.151 -0.016 1.177 -2.107 -0.628 -0.601 0.656 -0.039
phi -0.024 -1.662 0.583 -0.007 0.087 -2.752 1.893 0.928 0.556 0.066 -0.552
pit -0.379 0.858 -0.537 -0.035 -0.107 1.485 -0.397 -1.043 -0.147 0.52 0.594
sdn 0.175 1.526 -0.034 0.227 -0.111 2.575 0.441 0 -1.463 -0.272 0.099
sea 0.081 -0.268 -3.916 0.109 -0.309 -0.413 2.21 -6.553 -0.277 -0.177 2.066
sfn 0.232 0.097 -0.412 -0.061 0.017 0.166 -0.738 -0.616 -0.177 -0.346 -0.187
sln -0.032 -1.565 -0.153 -0.16 -0.005 -2.673 1.239 -0.378 0.652 0.044 -0.071
tba -0.385 2.728 0.701 0.109 -0.037 4.612 1.311 0.985 -1.067 0.535 -0.037
tex -0.665 -0.13 0.961 -0.16 0.187 -0.217 -2.908 1.624 0.317 0.987 -0.583
tor 0.633 -0.823 -0.573 -0.01 -0.13 -1.494 1.706 -0.926 0.272 -0.949 0.408
was 0.452 -1.116 0.218 0.051 -0.11 -1.844 1.755 0.359 0.255 -0.648 -0.185